BRIEF OHNE UMSCHLAG Haeckel, Karl Author: Haeckel, Karl Recipient: Paetel, Elwin; Paetel, Hermann Dating: 16.02.1882
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Paetel, Elwin; Paetel, Hermann Dating: 26.04.1882
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Paetel, Elwin; Paetel, Hermann Dating: 03.06.1882
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Paetel, Elwin; Paetel, Hermann Dating: 08.06.1882